METHOD OF ELECTROCHEMICAL TREATMENT OF HEATPROOF NICKEL ALLOY METAL WASTES THAT CONTAIN RHENIUM Russian patent published in 2010 - IPC C22B23/00 C22B61/00 C22B7/00 C25C1/08 C25C1/22 

FIELD: metallurgy.

SUBSTANCE: proposed method comprises dissolving wastes in acid electrolyte by applying AC electric field thereto. Dissolving is performed in nitrate or sulphate electrolyte on applying half-wave asymmetric AC industrial-frequency current and on using second electrode made from tantalum or niobium plates. Note here that anodic dissolution is carried at acidity of nitrate electrolyte at the level of 200-250 g/l HNO₃, while that of sulphate electrolyte making 150-200 g/l H₂SO₄ at 20-40°C and current of at least 1 kA.

EFFECT: increased process rate, better ecology.

3 cl, 3 tbl, 3 ex